diff options
| author | Leonardo Bras <leobras.c@gmail.com> | 2020-08-05 00:04:54 -0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-09-08 22:57:11 +1000 |
| commit | 74d0b3994e147a2b503170b5e02f1d07dc086586 (patch) | |
| tree | 1e8edd6a28f285d0f9cc41a24872968a893c657d /arch/powerpc/platforms | |
| parent | 80f0251231131d164eddab78d2b6c1b8e37d0093 (diff) | |
powerpc/pseries/iommu: Move window-removing part of remove_ddw into remove_dma_window
Move the window-removing part of remove_ddw into a new function
(remove_dma_window), so it can be used to remove other DMA windows.
It's useful for removing DMA windows that don't create DIRECT64_PROPNAME
property, like the default DMA window from the device, which uses
"ibm,dma-window".
Signed-off-by: Leonardo Bras <leobras.c@gmail.com>
Tested-by: David Dai <zdai@linux.vnet.ibm.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200805030455.123024-4-leobras.c@gmail.com
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/pseries/iommu.c | 45 |
1 files changed, 27 insertions, 18 deletions
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index 1a933c4e8bba..4e33147825cc 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -781,25 +781,14 @@ static int __init disable_ddw_setup(char *str) early_param("disable_ddw", disable_ddw_setup); -static void remove_ddw(struct device_node *np, bool remove_prop) +static void remove_dma_window(struct device_node *np, u32 *ddw_avail, + struct property *win) { struct dynamic_dma_window_prop *dwp; - struct property *win64; - u32 ddw_avail[DDW_APPLICABLE_SIZE]; u64 liobn; - int ret = 0; - - ret = of_property_read_u32_array(np, "ibm,ddw-applicable", - &ddw_avail[0], DDW_APPLICABLE_SIZE); - - win64 = of_find_property(np, DIRECT64_PROPNAME, NULL); - if (!win64) - return; - - if (ret || win64->length < sizeof(*dwp)) - goto delprop; + int ret; - dwp = win64->value; + dwp = win->value; liobn = (u64)be32_to_cpu(dwp->liobn); /* clear the whole window, note the arg is in kernel pages */ @@ -821,10 +810,30 @@ static void remove_ddw(struct device_node *np, bool remove_prop) pr_debug("%pOF: successfully removed direct window: rtas returned " "%d to ibm,remove-pe-dma-window(%x) %llx\n", np, ret, ddw_avail[DDW_REMOVE_PE_DMA_WIN], liobn); +} + +static void remove_ddw(struct device_node *np, bool remove_prop) +{ + struct property *win; + u32 ddw_avail[DDW_APPLICABLE_SIZE]; + int ret = 0; + + ret = of_property_read_u32_array(np, "ibm,ddw-applicable", + &ddw_avail[0], DDW_APPLICABLE_SIZE); + if (ret) + return; + + win = of_find_property(np, DIRECT64_PROPNAME, NULL); + if (!win) + return; + + if (win->length >= sizeof(struct dynamic_dma_window_prop)) + remove_dma_window(np, ddw_avail, win); + + if (!remove_prop) + return; -delprop: - if (remove_prop) - ret = of_remove_property(np, win64); + ret = of_remove_property(np, win); if (ret) pr_warn("%pOF: failed to remove direct window property: %d\n", np, ret); |